JPS61257507A - Vibration mechanism of compaction mechine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration mechanism for a compaction machine.

[Conventional technology]

In conventional compaction machines, in order to vibrate the rolling wheels in order to improve compaction efficiency, an eccentric load is attached to the rotating shaft provided on the rolling wheel along the rotational center line of the rolling wheel, and the rotating shaft is rotated. The rolling wheels were made to vibrate up and down with respect to the ground contact portion of the rolling wheels.

[Problem that the invention seeks to solve]

However, since this conventional compaction machine causes vertical vibration to rotate through the ground, it has the disadvantage of generating vibration pollution when installed in residential areas or near facilities that do not like ground vibration, and also has the disadvantage of striking and destroying the aggregate of the paving mixture. was there. In addition, in a compaction machine that performs vertical vibration, the vertical vibration acts directly on the rotating shaft of the rolling wheel, and acts as a force in the shearing direction (vertical direction) on the suspension rubber, which is combined with the vertical load and driving force of the machine body. Therefore, suspension rubber that can withstand this has to have a high spring constant (hard) and a large shape, even if it loses some of its vibration-proofing effect, which increases the cost and inevitably requires suspension rubber. Another problem was that vibrations that could not be absorbed by the machine were transmitted to the frame of the machine, causing great fatigue to the operator.

The present invention has been made in view of the above circumstances, and in order to prevent the occurrence of vibration pollution as much as possible and reduce operator fatigue, the present invention has a plurality of rotational forces provided in the radial direction of the transfer wheel. An object of the present invention is to provide a vibration mechanism for a compaction machine having a rotation conversion mechanism capable of transmitting horizontal vibration to a rotating shaft of an eccentric mass.

[Means for solving the problem and its operation] In order to solve the above problem, in the present invention, a plurality of rotating shafts to which eccentric masses are attached are arranged at at least two or more locations on the center line of rotation of the rolling wheel. The eccentric mass is rotatably mounted in the radial direction of the rolling ring via a bevel gear, and the eccentric position of each eccentric mass with respect to the axis of the rotating shaft is selected and arranged. do.

By employing the above configuration, substantially horizontal vibration can be generated in the rolling wheels using a very simple combination of bevel gears.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows a compaction machine 1 to which the vibration mechanism according to the present invention is applied.
FIG. Reference numeral 2 denotes a vehicle chassis on which a prime mover, a traveling device, a steering device, a driver's seat, etc. are provided, and 3 indicates running wheels provided on the vehicle chassis 2. The chassis 2 includes a frame 5 that supports rolling wheels 4
is attached via a connecting pin 6.

FIG. 2 is a sectional view showing a first embodiment of the present invention. Axles 7.7 are provided on the left and right sides of the frame 5, and a mounting body 9 is inserted into the axles 7.7 via suspension rubber 8.
．． 9 is fixed. On the other hand, inside the rolling wheel 4 there is a side plate 10.1.
0 is provided, and a hollow wheel shaft 11 is provided in the center of the side plate 10.10.
．． 11 is formed. The wheel axles 11, 11 are attached to the mounting body 9.
, 9 via bearings 12.12.12.12.

A hydraulic motor 13 for vibration excitation, which can rotate forward and reverse, is fixed to the center of either the left or right mounting body 9, and the output shaft of the hydraulic motor 13 penetrates between the left and right sides of the hollow wheel shaft 11.11. It is connected to the drive shaft 14 via a coupling.

The drive shaft 14 is centrally supported within the wheel axle 11.11 via a bearing 15.15.15.15, and
Two bevel gears 16a and 16b are provided on the inner side of the side plate 10.10 of the drive shaft 14, facing each other. On the other hand, on the inner surface of the side plate 10, bearings 1B, 18 are provided on the inner surface of the side plate 10. .18.18 and H+9.19.19.
It is pivotally supported via 19. The rotating shafts 17a, 17
Bevel gears 20a, 20 are provided at the inner ends of b, 17C, and 17d.
b, 20C, and 20d are provided, and each of the drive shafts 14
It meshes with bevel gears 16a and 16b provided in the. Moreover, each rotating shaft 17a, 17b, and 17c.

At the outer end of 17d are eccentric masses 21a, 21b and 21c.

21d is attached.

The eccentric positions of the eccentric masses 21a, 21b, 21c, and 21d are determined as follows in the first embodiment.

That is, the mutual relationship between the eccentric positions of the eccentric masses 21a and 21b and the mutual relationship between the eccentric positions of the eccentric masses 121c and 21d is such that they are eccentric in the same direction in the axial direction on the rotation center line of the rolling wheel 4, and They are placed at positions 180 degrees opposite to each other in the radial direction. Moreover, the eccentric mass 21a,
Correlation of eccentric positions of 21c and eccentric masses 21b, 21
The mutual relationship of the eccentric positions d is such that they are eccentric in the same direction in the axial direction on the rotational center line of the rolling wheel 4, and are spaced apart and located in the same radial direction.

Next, the operation of the vibration mechanism according to the first embodiment will be explained. With the compaction machine 1 stopped running, the hydraulic motor 13 rotates the rotating shafts 17a, 17b, 17.
c and 17d are rotated as indicated by the arrows, the outer circumferential end of the eccentric mass 21a is located around the rotation center line B in FIG. The eccentric mass 2 rotates in the order of G, F, and H.
The outer peripheral end of 1c is at position H, centering on the rotation center line C,
Rotates in the order of J and I, and the outer peripheral end of the eccentric mass 21d conversely rotates as H.
, I, J, in this order. During this rotation, eccentricity 1
When the outer peripheral end of i21a passes through the position, the eccentric mass 2
1b also passes the position, and when the outer circumferential end of the eccentric 'Jt121c passes the position H, the outer circumferential end of the eccentric mass 21d also passes the position H, so the rolling wheel 4 has a direction from B to D. The centrifugal force and the centrifugal force in the direction from C to H act synergistically. Similarly, when the outer peripheral end of the eccentric mass 21a passes through the position F during rotation, the outer peripheral end of the eccentric mass ff121b also passes through the position F, and when the outer peripheral end of the eccentric mass 21C passes through the position J, the eccentric mass 21d Since the outer peripheral end of the wheel also passes through position J, the centrifugal force in the direction from B to F and the centrifugal force in the direction from C to J act on the rolling wheel 4 in synergy.

On the other hand, when the outer peripheral end of the eccentric mass 21a passes through position E during rotation, the outer peripheral end of eccentric mass 121b passes through position G, but at the same time, the outer peripheral end of eccentric mass 21c passes through position K, Since the outer peripheral edge of f21 d passes through position ■,
The forces acting in the circumferential direction of the rolling wheels 4 cancel each other out.

Similarly, when the outer circumferential end of the eccentric mass 21a passes through the position G during rotation, the outer circumferential end of the eccentric mass 21b passes through the position E, but at the same time, the outer circumferential end of the eccentric mass 21c passes through the position
Since the outer peripheral end of the eccentric mass 21d passes through the position K, the same (forces acting in the circumferential direction of the rolling wheels 4) cancel each other out.

Therefore, the eccentric masses 21 a , 21 b , 21
c, 21 When d rotates, centrifugal force acts in the direction from B to D, centrifugal force in the direction from C to H, centrifugal force in the direction from B to F, and centrifugal force in the direction from C to J. .

That is, this centrifugal force acts on the rolling wheel 4 and causes the ground contact portion of the rolling wheel 4 to vibrate in the left-right direction within a horizontal plane.

In addition, while running the compaction machine 1, the eccentric mass ' 21
When a, 21b, 21c, and 21d are rotated, the rolling wheel 4
The ground-contacting portion of the vehicle performs a horizontal motion that is a combination of the above-mentioned left-right vibration and the forward or backward motion associated with running. Therefore, whether the compaction machine 1 is running or not running, the eccentric masses 21a, 2
When compaction work is performed by rotating the wheels 1b, 21c, and 21d, the rolling wheels 4 move to shake or knead the soil particles on the contact surface, resulting in damage to the aggregate of the paving mix and hair cracks. There is no occurrence of this, and the efficiency of compaction is improved.

In addition, vibrations in the horizontal plane have a higher vibration damping efficiency than vertical vibrations due to the characteristics of the ground. Therefore, vibration pollution can be greatly reduced in compaction work near facilities where ground vibrations are averse, and in construction on residential roads where there are many residences. At the same time, the generated left and right vibration acts on the suspension rubber as a force in the left and right directions, and the vertical load and driving force of the machine body change the direction of the force, resulting in a small shearing force, so the suspension rubber can withstand this force. As a result, the spring constant is small (soft), which naturally has a high vibration-proofing effect and reduces the transmission of vibration to the frame body, which has the advantage of reducing operator fatigue.

Next, a second embodiment will be explained based on FIG. 4. In this second embodiment, the configuration other than the mounting of the eccentric mass is the same as the first embodiment, so the same members are given the same reference numerals and explanations will be omitted.

Eccentricity! The eccentric positions of 22a, 22b, 22C, and 22d are determined as follows in the second embodiment.

That is, the mutual relationship between the eccentric positions of the eccentric masses 22a and 22b and the mutual relationship between the eccentric positions of the eccentric masses 22c and 22d is such that the eccentric masses 22a and 22b are eccentric in the same direction in the axial direction on the rotation center line of the rolling wheel 4, and the radius of the rolling wheel 4 is They are placed at positions 180 degrees opposite to each other. Further, the mutual relationship between the eccentric positions of the eccentric masses 22a and 22c and the mutual relationship between the eccentric positions of the eccentric masses 22b and 22d are such that the eccentric masses 22a and 22c are eccentric with a phase shifted by 180 degrees in the axial direction on the rotation center line of the rolling wheel 4, and are spaced apart. They are located in the same radial direction.

Next, the operation of the vibration mechanism according to the second embodiment will be explained. With the compaction machine 1 stopped running, the hydraulic motor 13 rotates the rotating shafts 17a, 17b, 17c, 17.
When d is rotated as shown by the arrow, the outer peripheral end of the eccentric mass 22a is located around the rotation center line B in FIG.
. H,
The outer peripheral end of the eccentric mass 22d rotates in the order of J, H, I. During this rotation, the eccentric mass 22
When the outer peripheral end of a passes through the position, the outer peripheral end of the eccentric mass 22b also passes through the position, but the outer peripheral end of the eccentric mass 22c and the eccentric mass ! Since the outer peripheral end of 22d passes through position J,
The centrifugal force in the direction from B to D is canceled by the centrifugal force in the direction from C to J. Similarly, when the outer peripheral end of the eccentric mass 22a passes through position F during rotation, the outer peripheral end of the eccentric mass 22b also passes through position F, but the outer peripheral end of the eccentric mass 22c and the outer peripheral end of the eccentric mass 22d pass through position H. As it passes, the centrifugal force in the direction from B to F is canceled by the centrifugal force in the direction from C to H.

However, when the outer circumferential end of the eccentric mass 1122a passes through position E during rotation, the outer circumferential end of the eccentric mass 22b passes through position G, and the eccentric mass! When the outer peripheral end of 22c passes through position I,
Since the outer peripheral end of the eccentric mass 22d passes through the position K, the sixth
In the figure, forces that rotate in the L direction (circumferential direction) act synergistically on the rolling wheels 4.

Similarly, when the outer peripheral end of the eccentric mass 1122a passes through the position G during rotation, the outer peripheral end of the eccentric mass 22b passes through the position iIE, and when the outer peripheral end of the eccentric mass 22c passes through the position K,
Since the outer circumferential end of the eccentric mass 22d passes through the position I, forces that rotate in the M direction (circumferential direction), which is opposite to the above-mentioned direction, act synergistically.

Therefore, the eccentricity lt amounts 22 a , 22 b , 22
When c and 22 d rotate, a force to rotate the rolling wheel 4 in the L direction and a force to rotate it in the M direction (opposite to the L direction) acts.

In other words, this force causes the ground contact portion to vibrate back and forth within the horizontal plane.

Moreover, while running the compaction machine 1, the eccentric mass 22 a
, 22 b , 22 c , and 22 d are rotated, the ground contact portion of the rolling wheel 4 performs a horizontal movement that is a combination of the above-mentioned longitudinal vibration and the forward or backward movement associated with running. . Therefore, the eccentric masses 22 a , 22 b , 22 c , 22 are present both when the compaction machine 1 is running and when it is not running.
When the compaction work is performed by rotating d, the rolling wheels 4 move to shake or knead the soil particles on the ground surface, so there is no destruction of the aggregate of the paving mix and no hair cracks. Moreover, compaction efficiency can be improved.

In addition, vibrations in the horizontal plane have a higher vibration damping efficiency than vertical vibrations due to the characteristics of the ground. Therefore, vibration pollution can be significantly reduced when compaction work is performed near facilities that are sensitive to ground vibrations, and when constructing residential roads with many residences. At the same time, the longitudinal vibration that occurs acts only as a moment around the rolling wheels around the rotating shaft of the rolling wheels, so the rotating shafts of the rolling wheels are not subjected to vibration, and therefore no vibrations act on the suspension rubber. Become,
This has the advantage of not causing any fatigue to the operator due to vibration.

In addition, 1. In the second embodiment, the length of the rotating shaft and the weight of the eccentric mass are shown as constant, but the invention is not limited to this.
It is sufficient that the product of the length of the rotating shaft and the weight of the eccentric mass is constant.

〔Effect of the invention〕

As explained above, the present invention includes a rotation conversion mechanism using bevel gears that transmits the rotational force of a drive source in a compaction machine to the rotating shafts of a plurality of eccentric masses provided in the radial direction of a rolling wheel so as to be able to horizontally vibrate. Therefore, it has the effect of generating almost horizontal vibration in the rolling wheels in a very simple manner.

[Brief explanation of drawings]

Fig. 1 is a side view of the compaction machine, Fig. 2 is a sectional view of a rolling wheel showing the first embodiment of the present invention, Fig. 3 is an explanatory view in the direction of the ■ arrow in Fig. 2, and Fig. 4 is the invention of the present invention. FIG. 5 is an explanatory view taken in the direction of the ■ arrow in FIG. 4, and FIG. 6 is an explanatory view taken in the direction of the ■ arrow in FIG. 4. 4... Rolling wheel, 5... Frame, 9... Mounting body, 10... Side plate, 11... Wheel axle, 12...
Bearing, 13... Hydraulic motor, 14... Vibrating drive shaft, 15... Bearing, 16a, 16b... Bevel gear, 17a, 17b, 17c, 17d-... Rotating shaft, 1
8, 19...Bearing,

Claims (1)

[Claims] A plurality of rotating shafts to which eccentric masses are attached are rotatably mounted so as to be positioned in the radial direction of the rolling wheels via bevel gears at at least two or more locations on the rotational center line of the rolling wheels, and A vibration mechanism for a compaction machine, characterized in that it is constructed by selecting and arranging the eccentric positions of each eccentric mass with respect to the shaft center.